D, Photosynthesis is with plants.
Well, nitrogen is the gas that makes up 78% of the earth's atmosphere.
I would guess its in the air that we breathe. I am not really sure. Just basing this answer off of research.
I think it would be to exchange gases. When you think about it, plants in the past were always underwater. They didn't have any air. Now, they are on land and need to be able to exchange gases from the leaves to the roots.
Answer:
If it is study island then it is B
Explanation:
B. the theory of evolution, or the theory that characteristics of populations can change over time.
Prokaryotes have two groups, bacteria and archaea, in which the three domain system recognizes the fundamental differences between the two.
